The Swiss Indoors is a professional men's tennis tournament that is part of the ATP Tour 500 category. Inaugurated in 1970, it is held in October on the indoor hard courts of the St. Jakobshalle in Basel, Switzerland.

In the pre-open era, the Swiss International Covered Courts, an indoor tennis tournament with the participation of foreign players, was held in Switzerland between 1920 and 1959. Indoor tennis was reintroduced in Switzerland in 1969 by Roger Brennwald, who organized the Barracuda Challenge tournament under a pressure balloon. The following year, still under pressure balloons, Brennwald organized the first edition of the Swiss Indoors in Basel, the winner of which received a wristwatch as a prize.

In 1977 the triumph of Bjorn Borg aroused enthusiasm among the spectators and the following year there was the first sponsored edition, which saw the spectacular final between Guillermo Vilas and John McEnroe. The best players on the circuit continued to arrive and in 1985 the record attendance in the stands rose to 50,000 for the week. In 1990 the capacity of the main stadium was increased to 8,500 spectators.

In 2006 came the first triumph in Basel for home player Roger Federer, who was a ball boy in the tournament as a child. The Swiss champion will set the records of 15 finals played and 10 titles won in the men's singles with subsequent victories in 2007, 2008, 2010, 2011, 2014, 2015, 2017, 2018 and 2019. In 2018 the restructuring of the St. Jakobshalle. The 2020 and 2021 editions were not held due to the COVID-19 pandemic.